"why did the hominids die?"
Well, Fred had a sudden heart attack, and Ethel died suddenly of an aneurism in her brain.
The darned Homos slaughtered Fred and Ethel's children in a battle over a gemsbok, if I remember correctly.
And that was the end of the line for the Hominid family. The family name is now gone, lost forever in history.
The Sapiens family, however, did well enough. The grandparents got a condo in Florida. Dad and Mom are getting ready to retire from their family business, and Junior is taking it over. Sue married a dentist, and is living in Brooklyn.
The only disappointment was with little Jack. Last anyone heard, he was smoking a lot of crack and was living somewhere in the Bowery.
Sad thing about those Hominids.
You know it, bubba.